The Siemens SENTRON 3VA1112-5EF32-0AC0 is a 3-pole molded case circuit breaker rated for 125 A continuous current and delivering 187 kA interrupting capacity at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V. The TM240 thermal-magnetic release provides fixed magnetic pickup and adjustable long-time delay (tr max. 1 s), letting you coordinate with downstream feeders.
The 125 A rating holds flat from 40 °C to 50 °C, then derates to 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. In a sealed enclosure with multiple breakers ganged, that derating curve is what governs the real-world ampacity — not the nameplate 125 A. The 70 mm depth and 76.2 mm width fit a standard 3-pole MCCB footprint on a DIN rail or panel-mount base, with IP40 protection on the front face suitable for general-purpose indoor switchgear.